171. 遇火斬火 Fight Fire With Fire
成就說明：在海亂鬼·炎威的武器附有烈焰的情況下，擊敗海亂鬼·炎威。
Defeat a Kairagi: Fiery Might while their weapon is infused with Pyro.
Kairagi かいらぎ 海亂鬼
172. 遇雷切雷 Ride the Lightning
成就說明：在海亂鬼·雷騰的武器附有電流的情況下，擊敗海亂鬼·雷騰。
Defeat a Kairagi: Dancing Thunder while their weapon is infused with Electro.
173. 雷自東來 I Hear Thunder...
成就說明：被雷斧丘丘暴徒引來的落雷擊中…
Be struck by the lightning called down by a CracklingAxe Mitachurl...
Cracklingv.（使）發狂
174. A Kill without Water
成就說明：不擊敗任何「水滴」的情況下（無相之水恢復時除外），擊敗無相之水。
Defeat the Hydro Hypostasis without destroying a single one of its Water Droplets (except when it is restoring HP.)
175. 海洋生物學者，歐拉！Bio-Oceanic Weapon
成就說明：被無相之水幻化的某種生物擊中…
Be hit by a certain animal created by the Hydro Hypostasis...
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